CT485B High Performance Microprocessor Temperature and Humidity Recorder Manual · 2002. 7. 9. ·...

CT485B-110V-G-AL, CT485B-220V-G-AL,CT485B-110V-W-AL, CT485B-220V-W-AL

High Performance MicroprocessorTemperature and Humidity Recorder

Operator’s Manual

NEWPORT Electronics,Inc.

Warranty/DisclaimerNEWPORT Electronics, Inc. warrants this unit to be free of defects in materials and workmanship for a period of one(1) year from the date of purchase. In addition to NEWPORT’s standard warranty period, NEWPORT Electronics willextend the warranty period for one (1) additional year if the warranty card enclosed with each instrument is returnedto NEWPORT.

If the unit should malfunction, it must be returned to the factory for evaluation. NEWPORT’s Customer ServiceDepartment will issue an Authorized Return (AR) number immediately upon phone or written request. Uponexamination by NEWPORT, if the unit is found to be defective it will be repaired or replaced at no charge.NEWPORT’s WARRANTY does not apply to defects resulting from any action of the purchaser, including but notlimited to mishandling, improper interfacing, operation outside of design limits, improper repair, or unauthorizedmodification. This WARRANTY is VOID if the unit shows evidence of having been tampered with or shows evidenceof being damaged as a result of excessive corrosion; or current, heat, moisture or vibration; improper specification;misapplication; misuse or other operating conditions outside of NEWPORT’s control. Components which wear are notwarranted, including but not limited to contact points, fuses, and triacs.

NEWPORT is pleased to offer suggestions on the use of its various products. However, NEWPORT neitherassumes responsibility for any omissions or errors nor assumes liability for any damages that result fromthe use of its products in accordance with information provided by NEWPORT, either verbal or written.NEWPORT warrants only that the parts manufactured by it will be as specified and free of defects.NEWPORT MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF ANY KIND WHATSOEVER,EXPRESSED OR IMPLIED, EXCEPT THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING ANYWARRANTY OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE HEREBYDISCLAIMED. LIMITATION OF LIABILITY: The remedies of purchaser set forth herein are exclusive and thetotal liability of NEWPORT with respect to this order, whether based on contract, warranty, negligence,indemnification, strict liability or otherwise, shall not exceed the purchase price of the component uponwhich liability is based. In no event shall NEWPORT be liable for consequential, incidental or specialdamages.

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PURCHASED,2. Model and serial number of the product under

warranty, and3. Repair instructions and/or specific problems relative

to the product.

FOR NON-WARRANTY REPAIRS, consult NEWPORTfor current repair charges. Have the followinginformation available BEFORE contacting NEWPORT:1. P.O. number to cover the COST of

the repair,2. Model and serial number of product, and3. Repair instructions and/or specific problems

relative to the product.

NEWPORT’s policy is to make running changes, not model changes, whenever an improvement is possible. Thisaffords our customers the latest in technology and engineering.NEWPORT is a registered trademark of NEWPORT ELECTRONICS, INC.

© Copyright 1999 NEWPORT ELECTRONICS, INC. All rights reserved. This document may not be copied,photocopied, reproduced, translated, or reduced to any electronic medium or machine-readable form, in whole or inpart, without prior written consent of NEWPORT ELECTRONICS, INC.

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High Performance Microprocessor-BasedTemperature/Humidity Recorder with Remote Sensor

i

TABLE OFCONTENTS

Page

Chapter 1 Introduction ....................................................................... 1-11.1 Parts of the Recorder - Front and Side Views .................................. 1-21.2 Parts of the Recorder - Rear View .................................................... 1-4

Chapter 2 Setting Up the Recorder ..................................................... 2-12.1 Placing the Recorder on the Bench Top .......................................... 2-12.2 Mounting the Recorder on the Wall ................................................ 2-32.3 Using Batteries ............................................................................... 2-4

2.3.1 Installing Batteries ............................................................... 2-42.3.2 Connecting ac Power .......................................................... 2-5

2.4 Installing the Chart Paper ............................................................... 2-62.5 Installing and Removing Pens ........................................................ 2-8

2.5.1 Installing the Pens ............................................................... 2-82.5.2 Removing the Pens .......................................................... 2-10

2.6 Installing the Temperature/Humidity Sensor � � ................................. 1 12.6.1 Using the Short Cable ....................................................... 2-112.6.2 Using the Remote Sensor Cable ...................................... 2-122.6.3 Using the Sensor Clip ....................................................... 2-13

Chapter 3 Powering Up the Recorder ................................................. 3-13.1 Turning on the Recorder ................................................................. 3-13.2 Recording the Code Numbers ........................................................ 3-13.3 Comparing Code Numbers � ............................................................. 3-23.4 Final Display Mode......................................................................... 3-3

Chapter 4 Alarm Operation ............................................................... 4-14.1 Alarm Description ........................................................................... 4-14.2 Checking Alarm Limits .................................................................... 4-14.3 Unlocking/Locking the Control Panel Door� ...................................... 4-2

4.3.1 Unlocking the Control Panel Door........................................ 4-24.3.2 Locking the Control Panel Door � ........................................... 4-2

5.3.1 Humidity Calibration at 33% Humidity.................................. 4-25.3.2 Humidity Calibration at 75% Humidity� ................................. 4-2

4.4 Setting/Changing Alarm Limits ....................................................... 4-34.5 Turning the Alarm Off...................................................................... 4-44.6 Disabling the Alarm ......................................................................... 4-5

Chapter 5 Calibrating the Recorder .................................................... 5-15.1 Factory Calibration Information ...................................................... 5-15.2 Changing Calibration Codes ........................................................... 5-15.3 Calibrating Humidity Readings ...................................................... 5-3

5.3 Calibrating Temperature Readings ................................................ 5-3

�

�

Chapter 8 Maintaining the Recorder .................................................. 8-18.1 General Considerations ................................................................. 8-18.2 Light Bulb and Push Button Information ......................................... 8-28.3 Case Care....................................................................................... 8-38.4 Storage of Chart Paper .................................................................. 8-38.5 Power Failure Mode (Chart Paper Indication) ................................ 8-3

Chapter 9 Troubleshooting the Recorder ............................................ 9-1

Chapter 10 Technical Details ............................................................ 10-110.1 Sensors and Measurement ............................................................ 10-110.2 Pen Arm Drive ................................................................................ 10-110.3 Chart Paper Drive Mechanism ...................................................... 10-210.4 Power Supply Supervision ............................................................ 10-2

Chapter 11 Specifications ................................................................ 11-1

Index ....................................................................................................... I

High Performance Microprocessor-BasedTemperature/Humidity Recorder with Remote Sensor

ii

TABLE OFCONTENTS

Chapter 6 Using the Cal-Lock Kit ........................................................ 6-1

Chapter 7 Using the BNC Input Adapter (Optional) ............................. 7-1

Introduction

1-1

1

This Electronic Temperature and Humidity Chart Recorder with Remote Sensor is an advanced microcomputer controlled measuring and recording instrument.

The recorder affords rapid and precise response, memory and display of peakreadings, remote sensing, recording flexibility and simplicity of operation. Thiscompact, portable instrument offers advanced features previously unavailable inits price range.

Features include:

Continuous Update of Ambient °C or °F Temperature and Relative HumidityRapid Response to Changes in Ambient Temperature and Humidity Remote Mount SensorDigital Plots in 1.0 °C or 1% IncrementsMemory and Display of Peak Readings1, 7 or 32 Day ChartsBattery or ac Power Operation With Automatic Battery Power BackupChart Indication for ac Power Failure/ac Power ReturnAudible Alarm with Relay ContactLow Battery IndicatorPortableWall Mount or Benchtop MountOptional Analog Voltage Input Adapter to record an external 20 to 1200m Vdc signal using the temperature penChart Lighting with use of ac adaptorControl Panel LockDecorative Foot Cover for wall mounting

These features provide precise documentation, flexibility in application and easeof use, all made possible through the incorporation of advanced electronics.

1.1 Parts of the Recorder - Front and Side Views

Figure 1-1. Front and Side Views of the Recorder

Item Description Function

1 Chart Paper Knob (magnetic) Holds chart paper in place.

2 Light Bulbs Lights up the paper in a dark room. Note that the bulbs function onlywhen the recorder is powered by the 9Vdc adapter.

3 Pen Cap Posts Holds the loose pen caps.

4 Time Set Arrow Helps align the time on the new chart paper with the actual time.

5 Chart Paper (double sided) Charts are available for 1, 7, and 32 day recording times. See theinside back cover for a detailed list of paper available.

Introduction1

1-2

FRONT VIEW SIDE VIEW

HIGH SET LOW

ALARM

CHART TYPE

1

7

32

°C

°F

PWR

I

0 74RH°C°F

TEMPERATURE

HUMIDITY

15

1

15

5

717

910

8

1211

1918

2

43

202

14

13

18

6

16


6 ac Power Jack Allows the unit to be powered from ac power using the ac adaptor(110Vac stepped down to 9Vdc) supplied.

7 Power Switch Turns unit ON (|) or OFF (O).

8 °C/°F Mode Switch Selects °C or °F chart operation. Note the following:When switching from °C to °F, ONLY the Humidity pen will move. The humidityzero point and scaling are different on °C and °F paper, causing the humidity pento move when switching from °C to °F. The temperature zero point and scaling are the same on °C and °F paper (only the units change). Therefore the temperature pen will not move.

.

9 1/7/32 Day Mode Switch Selects chart type: 1, 7, or 32 day operation.

10 Alarm Display Buttons These buttons are accessible behind the control panel door.(HIGH, SET, LOW) High and Low buttons:

1. Selects and changes calibration codes.2. Chooses the high/low alarm limit (for either °C or pH).3. Selects and changes the alarm limits.4. Checks alarm limits in operating mode.5. Low button only: when pressed during power up, disables the

alarm function.

Set button:1. Activates calibration mode when pressed during power up.2. Enters calibration codes in memory.3. Activates alarm limits.4. Enters alarm limits in memory.5. Disables the sounding of the alarm (and activation of the relay)

for 10 seconds.

11 LCD Display Displays temperature and Humidity values (depending on the setting ofDisplay Selection Switch).

12 Display Selection Switch Allows the user to select display of the current relative humidity, orambient temperature in either °C of °F. (Refer also to item #10)

13 Temperature/Humidity Sensor Houses the electronic sensors which measure ambient temperature andrelative humidity.

14 Sensor Holder (clip) Holds the temperature/humidity sensor to the side of the recorder.

15 Pen Arm and Holder (2 each) Holds and moves the pH and temperature pens.

16 Latch Button Releases and secures the recorder’s door.

17 Control Panel Door Lock Locks or unlocks the control panel door.

18 Decorative Foot Cover Stays in place for wall-mounting the recorder. Removed for uprightbench-top use.

19 Control Panel Door Covers the alarm display buttons (High, Set, and Low), power switch,1/7/32 day mode switch, and Cal/Normal mode switch.

20 Light Push Button Turns the light bulbs and display backlight on and off.

Introduction 1

1-3

1.2 Parts of the Recorder - Rear View

Figure 1-2. Rear View


21 Keyhole Slot Mounting Holes Allows the recorder to be mounted on the wall.

22 Carrying Slot Allows the user to carry the recorder conveniently.

23 Product Label Product information label.

24 Alarm/Relay Contacts Allows the user to hook up an external, dry contact alarm to therecorder.

25 Battery Compartment Holds 4 D size batteries which provide power if the ac adaptor isnot used, or with adapter, provide power backup in case of ac powerfailure.

25

21

22

23

24

Foot Cover Removed

Introduction1

1-4

Setting Up the Recorder

2-1

2

Now that you have learned about the different parts of the recorder, you can setit up.

Determine whether you want the recorder wall mounted or sitting on a benchtop.

2.1 Placing the Recorder on the Bench TopFigure 2-1 shows the removal of the decorative foot cover.

1. Place the recorder on its back (so it is face up).

2. Remove the clip-on foot cover by lifting up on the cover and releasing it fromthe stabilizing arm at the bottom of the recorder. This exposes the rubber feetand stabilizing arm. The rubber feet protect the bench top surface.

DO NOT ATTEMPT TO SET THE RECORDER UPRIGHT ONTHE BENCH WHEN THE CLIP-ON FOOT COVER IS INPLACE. THE RECORDER WILL TOPPLE OVER.

Figure 2-1. Foot Cover Removal

Clip

Cutaway View

CAUTION

3. Swing out the stabilizing arm and extend it towards you. Figure 2-2 showshow to swing out the stabilizing arm. Make sure the slot in the stabilizing armextends out the rear of the recorder.

Figure 2-2. Swiveling Stabilizing Arm

When the recorder is in normal operating position (the dooris closed and the control panel door is closed), the stabilizingarm should be pushed to middle position (the bumps on thearm will click in place under the recorder). Refer to Figure 2-3a.

Note that the arm extends towards the front or rear of thecase. If the unit is placed on a bench top snug against thewall, extend the stabilizing arm fully to the front of the unit.Refer to Figure 2-3b.

Figure 2-3a. Stabilizing Arm use Figure 2-3b. Stabilizing Arm in Extendedfor Bench Top Use (normal position) Position (position when you open door)

HUMIDITY

pH

ϒC

HUMIDITY

pH

ϒC

NOTE

Swing

HUMIDITY

pH

ϒC

Setting Up the Recorder2

2-2

2.2 Mounting the Recorder on the WallTo mount the recorder on the wall, first locate the wall mounting holes using thetemplate provided in the wall mounting kit. Leave the decorative foot cover(Figure 1-1, item #18) in place*. After drilling the holes, insert the wall anchorsand put in the screws, leaving 1⁄�8 inch (3 mm) between the screw heads and thewall. Hang the recorder by positioning the two (2) “keyholes” in the rear coverover the screw heads.

The ac adaptor has a 6 foot (2 meter) cable.

* If the decorative foot cover is not in place, go through the following steps toreinstall the cover (if desired):

1. Place the recorder on the table (so it is front face up).2. Roughly position the foot cover so the clips are in line with the stabilizing

arm. Gently “stretch” the clips out and position over the arm as shown inFigure 2-4a.

3. Once the clips are in place, gently slide down until the foot cover is evenwith the front of the recorder as shown in Figure 2-4b.

Figure 2-4a. Installing the Foot Cover Figure 2-4b. Installing the Foot Cover (Side View)(Top View)

Clip

Cutaway View

Clips

pHRECORDER

TEMPERATURE

pH

C

NOTE

Setting Up the Recorder 2

2-3

2.3 Using BatteriesThe recorder operates on either four “D” size batteries or on ac power. 110Vacand 220Vac adaptors are available.

In the event of ac power failure, the unit will switch over tobattery power automatically.

Keep a fresh set of batteries in the unit in case of poweroutage, when it can be especially important to have a recordof pH and fluid temperature.

2.3.1 Installing BatteriesYou may power the recorder with four “D” size batteries. For adequateperformance and battery life, use alkaline batteries. The recorder operates fulltime on battery power alone for up to one month when using fresh alkalinebatteries. When replacing batteries, we recommend that you use DuracellMN1300 “D” size batteries for long life and for best performance at lowtemperatures.

To install the batteries (refer to Figure 2-5):

Figure 2-5. Battery Compartment and Battery Orientation

To Open Battery Orientation

+ ± + ± + ± + ±

Bench Top Set-Up

NOTE


2-4

1. Open the control panel door.2. Turn the power switch to O position.3. Place the recorder on a soft surface front face down. Locate the battery

compartment at the bottom.4. Open the battery compartment door by pressing down firmly on the tabs

located along the top edge.5. Remove the battery door.6. Install the batteries, oriented as shown in Figure 2-5, in the battery

compartment.7. To replace the battery door, first place the bottom edge of the door into the

positioning slots in the compartment.

8. Push down on the door to snap the tabs in place.

The recorder continuously monitors the battery voltage. A “LO BAT”indication in the upper left-hand corner of the main LCD (refer to Figure 2-6)indicates that only one to two weeks of reliable battery operation remain, andthat the batteries need replacing within this time frame. Also, if the unit isoperating under battery power and the battery voltage is too low to permitreliable operation, the system shuts down and displays “---” in the LCD. Thesystem may be restarted by changing the batteries or by the re-initiation of acpower. If ac power fails, the circuitry will attempt to automatically switch tobattery backup. If viable battery power is available, the system will operate onbattery power until the batteries fail or ac power returns. When ac powerreturns, the recorder will automatically reset itself (refer to Section 8.5).

Figure 2-6. Battery Warnings

2.3.2 Connecting ac PowerThe recorder can be ac powered using the 9Vdc, 1Amp ac adaptor supplied. Theac power jack is located on the right side of the unit (refer to Figure 1-1, item#6.). Make sure the power switch on the control panel (refer to Figure 1-1, item#7) is in the “O” position when plugging in the ac adaptor. The adaptor cable is6 feet (2 meters) long.

RH°C°F

System Shut-Down

LO BAT


2-5

2.4 Installing the Chart PaperThe recorder accepts three different types of chart paper. Charts are available for 1, 7 and 32 day recording times. Although chart paper replacing is very simple,you must take care to set the appropriate front panel switches to match the paperbeing used. Set the chart type and °C/°F switches (refer to Figure 2-7) tothe following positions for these six (6) modes of operation.

Chart Type Switch (Days) CAL/NORMAL Paper Type

1 F 1-day, Fahrenheit paper

1 C 1-day, Celsius paper

7 C 7-day, Celsius and pH paper


32 C 32-day, Celsius and pH paper


Figure 2-7. Chart Switches

You may obtain specialized paper as well. Refer to the inside back cover for thecomplete list.

RH°C°F

HIGH SET LOW17

32°F

°C0

I

CHART TYPEPWRALARM


2-6

To change the chart paper:

1a. Table Mounted Recorder:

To balance the recorder, fully extend the stabilizing arm at the bottom of therecorder. Refer to Figure 2-8. Continue to Step 2.

Figure 2-8. Stabilizing Arm Fully Extended

1b. Wall Mounted Recorder:

You can also leave the recorder on the wall if it is easily accessible.

2. Open the door and hold it open with left hand.

3. Remove the magnetic chart paper knob (Figure 2-9, item #2) and used chartpaper.

4. Place the new chart paper (Figure 2-9, item #1) on the spindle and rotate ituntil the current time on the chart paper is aligned with the time arrow on thechart base of the recorder. See Figure 2-9 detail.

5. When the chart paper is correctly oriented, replace the magnetic knob (Figure 2-9, item #2), being careful not to alter the position of the chart paper.

6. Make sure that the “Chart Type” switch, located behind the control panel door,is in the correct position relative to the chart paper used.

If the switch is in the wrong position, the chart paper will notrotate at the correct speed and the indicated chart time willnot correspond to real time.

NOTE

HUMIDITY

pH

ϒC


2-7

Figure 2-9. Changing Chart Paper and Setting the Time

2.5 Installing and Removing Pens2.5.1 Installing the Pens

The recorder uses two different colored pens to record information. The red(upper) pen records temperature.The blue (lower) pen records relative humidity.�Pen life varies with use and climate. Under normal operating conditions, pens last atleast one month. We recommend that you install a fresh set of pens� �after every month of use.

To install pens:

1. Make sure the power switch on the front panel is in “O” position. The frontpanel is located under the control panel door. The recorder door should beclosed.

The control panel door opens easily by gently gripping therecessed area at the right side and slowly pulling down.

2. Examine the location of the pen arms through the window in the recorder door.

a. If the pen arms are offset as shown in Figure 2-10, continue to Step 3:

Figure 2-10. Offset Alignment of Pens (for ease of pen installation)

OR

Temperature TemperaturePen Pen

HumidityPen

HumidityPen

NOTE

HIGH SET LOW17

32Normal

Cal

0

CHART TYPEPWRALARM

1

7 PM

8 PM

PM

6 PM

5 P

NOTE: ROTATE CHART PAPERUNTIL PRESENT TIME

LINES UP WITH ARROW.

1

2

pH

ϒC


2-8

� 7:00 PM

b. If the pen arms are vertically aligned as shown in Figure 2-11, do thefollowing and then proceed to Step 3.

Figure 2-11. Vertical Alignment of Pens (pens can’t be inserted)

(The pen arms must be offset sufficiently to allow for clearance before insertionor removal is attempted. The pens must be moved electrically.)

• Make sure the recorder door is closed and a piece of chart paper is installed on the spindle on the chart base.

• Turn the unit back on by moving the power switch to “|” and wait forthe pens to be far enough apart to remove a used pen one at a time orto insert a new pen one at a time.

DO NOT ATTEMPT TO OFFSET THE PENSMANUALLY (BY HAND). THE DRIVE MECHANISMCOULD BE DAMAGED. DO NOT ATTEMPT TOCHANGE THE PENS WHILE THEY ARE IN MOTION.

• Turn off the unit (PWR switch position in “O” position) to stop the penmovement.

3. Open the recorder door by applying downward pressure on the latch button(refer to Figure 1-1, item #16).

4. Remove the pens from the package and the cap from each pen.

We recommend that you put the pen caps on special posts located on the chartbase of the recorder near the light bulbs. Figure 2-12 shows the location of theposts.

Figure 2-12. Post Location for Pen Caps


































pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

pHRECORDER

TEMPERATURE

Pen Cap Posts

CAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTIONCAUTION

TemperaturePen

HumidityPen


2-9


2-9


2-9


2-9

5. Insert the blue pen fully into the lower (humidity) holder and the red penfully into the upper (temperature) holder.

If you installed the pens correctly, you will hear a click as they positionthemselves in the holders. Figure 2-13 shows how to insert the pens.

6. Close the recorder door.

Figure 2-13. Pen Installation

2.5.2 Removing the Pens1. Check to see that the pens are offset as shown in Figure 2-10. Otherwise, you

can damage the arm and drive mechanism if you try to remove them.

DO NOT ATTEMPT TO OFFSET THE PENS MANUALLY (BYHAND). THE DRIVE MECHANISM COULD BE DAMAGED.DO NOT ATTEMPT TO CHANGE THE PENS WHILE THEYARE IN MOTION.

2. Perform Step 2b in Section 2.5.1 to offset the pens.

3. With a screwdriver in one hand, push on the rectangular area of the pen shownin Figure 2-14. Using the other hand, release the pen from the spring clipattached to the pen holder.

Figure 2-14. Pen Removal

CAUTION


2-10

4. At the same time, slide the pen out from the pen holder.

5. Install new pens following Section 2.5.1, Steps 3 through 6.

2.6 Installing the Temperature/Humidity SensorThe temperature/humidity sensor can either be directly attached to the recorderusing its own attached short cable or be extended by using the remote sensor cable.

2.6.1 Using the Short Cable1. Place the handle part of the sensor in to the sensor clip on the side of the

recorder as shown in figure 2-15.

2. Install the connector into the socket at the side of the recorder

3. Slide the sensor up so that the sensor vents are well above the top of the case.Refer to the center picture in Figure 2-15.

. Make sure thesensor cable is untwisted.


2-11

HIGHHIGH SETSET LOLOW

ALARMALARM

CHARCHART T TYPETYPE

1

7

3232

°C

°F

PWR

I

0 74RH°C°F

TEMPERATURE

HUMIDITY

Figure 2-15. Attaching the Sensor (left picture), Correct Position (center),Incorrect Position (right)

LOW

74RH°C°F

TEMPERATURE

HUMIDITY

2.6.2 Using the Remote Sensor Cable1. Connect the end of the cable with the arrow to the short cable on the sensor.

Line up the two arrows as shown in Figure 2-16 before mating the two cables.

2. Connect the other end of the remote sensor cable (without the arrow) to thesocket at the side of the recorder.

Figure 2-16. Using the Remote Sensor Cable


2-12

For accurate temperature and humidity readings, only onelength of remote sensor cable may be used

NOTE


HIGH SET LOW

ALARM

CHART TYPE

1

7

32

2.6.3 Using the Sensor Clip

An extra sensor clip is provided in the shipping box, so you can hang the sensorin a remote location. Two self-tapping screws are provided for, mounting towood, sheet rock or plastic surfaces. When mounting to wood or sheet rocksurfaces, drill two 1/16” (1.5mm) diameter holes. When mounting to plastic, drilltwo 5/64” (1.9mm) diameter holes. Appropriate hardware must be selectedwhen mounting to metal surfaces. Refer to figure 2-17.

Figure 2-17. Using the Sensor Clip for Mounting Sensor in a remoteLocation,

2-13

12 12

3

4567

8

9

1011

TEMPERATURE

HUMIDITY

RH°C°F

74

Notes

LOW

TEMPERATURE

HUMIDITY


Powering Up the Recorder3

3.1 Turning on the RecorderOpen the control panel door by gently gripping the recessed area at the rightside of the door and slowly pulling down.

Turn the recorder on by moving the power switch located on the control panel tothe “|” position. Refer to Figure 3-1 for the location of the switch.

Figure 3-1. Power Switch

You then hear 1 beep and the LCD display shows the following:

Figure 3-2. First LCD Display

The displays in Section 3.2 come up quickly once you turn on therecorder. Be prepared to write down the codes as you see them on therecorder display. You can then compare the codes your recorderdisplayed with the probe label as described below. After the two groupsof codes are displayed, the recorder continues with its sequence, and thepens move. More details are provided in Sections 3.3 and 3.4.

3.2 Recording the Code NumbersA two-character Humidity code made up of numbers and/or letters 0, 1, 2, 3, ... , 8, 9, a, b, and c appears. An example is shown in Figure 3-3; the numbers will vary:

Write your code here

Figure 3-3. Relative Humidity Code

35

RH

¡F¡C

LO BAT

RH

¡F¡C

RH

ÿFÿ

HIGH SET LOW17

32°F

°C

0

I

CHART TYPEPWRALARM

RH

¡C

Then, a single-character temperature code, a number or letter 0,1,2,3,...,8,9,a, b, or c,appears. An example is shown in Figure 3-4; the number will vary:

Write your code here

Figure 3-4. Relative Humidity Code

2RH

¡F¡C


3.3 Comparing Code NumbersThe recorder will continue with its initialization process for about another 30 seconds. Locatethe code numbers in the sensor calibration label. Refer to figures 3-5 and 3-6. The two-character Humidity Code you wrote down should match the two-character code following theletter “h” on the label. If it does not, refer to Section 5.1, changing Calibration Codes.

The single character Temperature code should match the single-character codefollowing the letter “T” on the label. Refer to figure 3-7. If it does not, refer to Section5.1, Changing Calibration Codes.

Figure 3-5. Location of Sensor Codes.

Figure 3-6. Relative Humidity Code Locator

Figure 3-7. Temperature Code Location.

3-2

H35 T2H35 T2

RH°C°F H35 T235

RH°C°F H35 T22

Powering Up the Recorder 3

3.4 Final Display ModeAfter the relative humidity and temperature codes appear, the LCD displays thecurrent relative humidity in %RH or temperature in °F or °C, depending on theposition of the display selection switch (refer to Figure 3-8).

Figure 3-5. Location of Sensor Codes.

At the same time, the temperature pen and humidity pen, one at a time, move tothe right a short distance and then move to the left to the zero position. Then,both pens, one at a time, move to the position which correspond to the currentrelative humidity and temperature.

At this point, the recorder is ready to use.

RH°C°F

HIGH SET LOW17

32°F

°C0

I

PWRALARM

Notes


Alarm Operation

4-1

4

4.1 Alarm DescriptionThe chart recorder is equipped with an alarm system which is activated whenthe sensor conditions exceed user-set limits. The system consists of a built-inaudible piezo-electric beeper and a set of normally open dry relay contacts foractivating an external alarm. The contacts are rated for 2 amps at 110Vac or 2amps at 30Vdc. The contact terminals are mounted on the rear of the recorder(refer to Figure 4-1). In addition, the LCD display will flash upon alarmactivation.

Figure 4-1. Alarm/Relay Contacts Location

4.2 Checking Alarm LimitsWAIT UNTIL THE UNIT HAS STABILIZED AND THE PENS STOP MOVINGBEFORE PRESSING ANY KEYS ON THE KEYBOARD.

• Depending on the Display Selection Switch position, the display willbe in °F, °C, or %RH for the alarm limit viewing.

• The word ‘hi’ and the high limit value of the alarm may be seen on thedisplay after pressing the “HIGH” button on the front panel.

• The word ‘lo’ and the low limit value of the alarm may be seen on thedisplay after pressing the “LOW” button on the front panel.

The alarm limits are stored in permanent EEPROM memoryand will not be lost even if power is interrupted and batterybackup fails.

NOTE

Alarmdc or acPowerSupply

Rear

BatteryCompartment

(External PowerSupply And AlarmNot Included)

Foot Cover Removed

4.3 Unlocking/Locking the Control Panel DoorTo access the Alarm Display Buttons (Figure 1-1, item #10) under the controlpanel door, you may have to unlock the door. You’ll find the control panel doorlock to the left of the control panel. Refer to Figure 4-2.

Figure 4-2. Location of the Door Lock

4.3.1 Unlocking the Control Panel DoorUse a small screwdriver to turn the lock to the left as far as it will go. Figure 4-3shows the unlocked position.

Figure 4-3. Door Unlock Position

4.3.2 Locking the Control Panel DoorUse a small screwdriver to turn the lock to the right as far as it will go. Figure 4-4 shows the locked position.

Figure 4-4. Door Lock Position

RH

°C°F

HIGH SET LOW17

32°F

°C0

I

CHART TYPEPWRALARM

74

Alarm Operation4

4-2

4.4 Setting/Changing Alarm LimitsTo set the alarm limits on the alarm recorder:

1. Set the display selection switch (Figure 1-1, item #12) to %RH,¡C or ¡F , dependingon the parameter for which you would like to set the alarm limits. Refer toFigure 3-8 for the location of the switch.

2. Open the control panel door (unlock it, if necessary).

3. Press the SET button to activate the display to set either the high OR low alarmlimit. At this time, SE is displayed. Figure 4-5 shows the location of theAlarm Display Buttons.

Figure 4-5. Alarm Display Buttons (HIGH/SET/LOW)

4. Release the SET button. The display will alter nately flash hi and lorepeatedly.

5a. To change the high alarm limit:

• Press and hold the “HIGH” button for 4 seconds, then release.

‘hi’ is displayed and then the current high alarm limit is displayed.

• Press the “HIGH” or “LOW” button to respectively increase or decrease thevalue.

• Press the “SET” button to lock in the value(s); the display now shows “SA”.

• Continue to step 6.

HIGH SET LOW17

32°F

°C0

I

CHART TYPEPWRALARM

7 4RH°C°F

Alarm Operation 4

4-3

¡C and ¡F slsrm are really the same alarm, shown in differentmessuring units.

NOTE

OR

If, after about 15 seconds, you don’t press the “SET” button toenter the desired value, the alarm recorder returns the displayto the normal operation.

You can double check your limits at any time by pressing the “HIGH” and“LOW” buttons.

6. Go through steps 1-5 to check and/or change the limits for the otherparameters. For example, if you already checked or changed °C, you maycheck or change pH if you choose.

7. After you are all done with the changes, close and lock the control panel door,if necessary.

4.5 Turning the Alarm OffIf the high or low alarm limit for humidity or temperature is exceeded, you willhear the alarm. In addition, if the unit is operating under battery power and thebatteries are about to fail, you will hear the alarm.

The alarm will stay on even after the condition which caused the alarmdisappears. Refer to the example below:

Temp High Limit Actual Temp. Alarm Sounding

75° 74° OFF

75° 75° ON (temp rises)

75° 74° ON (temp drops) ***

***The alarm stays on even though the temperature drops below the limit. The alarm recorder will not reset automatically.

NOTE

Alarm Operation4

4-4

5b. To change the low alarm limit:

• Press and hold the “LOW” button for 4 seconds, then release.

‘lo’ is displayed and then the current low alarm limit is displayed.

• Press the “HIGH” or “LOW” button to respectively increase or decrease thevalue.

• Press the “SET” button again to lock in the value(s); the display now shows“SA”.

b. You can now proceed with the changing the alarm limits as described in Section4.4.

c. After you are all done with the changes, lock the control panel door ifnecessary.

4.6 Disabling the Alarm1. Unlock the control panel door if necessary.

2. On power up, when you hold the “LOW” button down, an “AO” messageappears in the display and the beeper sounds. This will disable the alarmfunction.

(This action sets the high pH limit to 121, the low pH limit to 01, the hightemperature limit to 99, and the low temperature limit to 01. Since theselimits are outside the normal measuring range of the alarm recorder, thealarm function is effectively disabled.)

The alarm limits are set this way when you receive the unit. If the alarm isdisabled, you must re-initialize the instrument. After you are done with thechanges, lock the door if necessary.

3. To verify the settings after re-initializing is completed, press the “LOW” button toget the low value, and the “HIGH” button to get the high value.

Alarm Operation 4

4-5

1. Unlock the control panel door if necessary.

2. After the alarm becomes activated, the “SET” button must be pressed to disable it.

The message “AO” appears in the display. The alarm is disabled for 10seconds. After 10 seconds, the alarm may activate again, but only if analarm condition is present.

If the alarm is activated and you wish to change the alarm limits:

a. Press the “SET” button for 5 seconds.

First “AO”, then “SE” message will appear in the display.

Notes

Alarm Operation4

Calibrating the Recorder

5-1

5

5.1 Factory Calibration InformationThe recorder is factory calibrated during final assembly by calibrating the sensor(shipped with the recorder) to known temperature and humidity standards in an �enviromental chamber. This technique avoids tracking and positioning errors �due to temperature changes and mechanical shock. However, if the humidity�readings drift or appear out of calibration, follow Section 5.2 to �recalibrate your recorder.

� � � ��

5.2 Changing Calibration Codes

T

You may want to change the calibration codes for several reasons:��•� The calibration codes on the sensor probe and the recorder do not match.��•� A replacement probe is being used, and the calibration codes must be �� changed to match.��•� You want the recorder to more closely match the reading of another�� instrument.��•� You wish to perform your own recalibration. In this case, go through�� Sections 5.3 and 5.4, Calibrating Humidity Readings and Calibrating�� Temperature Readings.

o change the calibration codes:

1. Open the control panel door (unlock it, if necessary).

2. Turn the power switch to the off (“O”) position.

3. Press and hold down the “SET” button while turning on the power switch. Thisbutton is one of three Alarm buttons shown in Figure 4-5.

After you hear an audible beep, you will see the following display:

Figure 5-1. First Display

Then “CH” appears on the display.

4. At this time, release the “SET” button.

RH

ϒFϒC

LO BAT

5a. If the first character is correct,

press the “SET” button and go to step 6.

5b. If the first character is not correct, press the “HIGH” button to increase the value of the character or the“LOW” button to decrease the value of the character. When this characteris correct, press the “SET” button.

6. The second character should now be blinking. Refer to Figure 5-3. If it is not,press the “SET” button until it does.

Figure 5-3. Temperature Code - Second Character Blinking

7a. If the second character of the temperature calibration code is correct, press the “SET” button and go to step 8.

7b. If the second character is not correct, press the “HIGH” button to increase the value of the character or the“LOW” button to decrease the value of the character. When this characteris correct, press the “SET” button.

5 7

Calibrating the Recorder5

5-2

A 2-character humidity calibration code should now appear in the display �with the first character blinking. Refer to Figure 5-2. Remember, this�calibration code must match the code on the sensor probe.

� � ��

Figure 5-2. Temperature Code - First Character Blinking

RH

ϒFϒC5 7

RH

ϒFϒC

9b. If the temperature code is not correct,

press the “HIGH” button to increase the value of the character or the“LOW” button to decrease the value of the character. When this characteris correct, press the “SET” button to lock in the values.

At this time, you see the humidity and temperature codes on the display as�you entered them. This way, you can verify that you entered them corr� � � .ectly

10. The unit should now automatically go through the power up sequence as

10. If you have altered the humidity or temperature codes in order to have the recorder match the reading of another instrument, or you have performed yourown recalibration of the instrument, the code on the probe must be changes ordocumented to reflect the changes made to the recoeder. For recalibration,refer to Sections 5.3 and 5.4.

described in Chapter 3. If it does not, hold down the “SET” button until it does.

While the unit goes through the power up sequence, observe the display tosee that the calibration values are what they should be and that they havebeen entered correctly.

11. If either the temperature or pH code is incorrect,

repeat steps 1-10. After you are all done with the changes, lock thecontrol panel door, if necessary. Refer to Section 4.3 for details.

Calibrating the Recorder 5

5-3

8. A single character pH calibration code "6" should be blinking in the display.Refer to Figure 5-4. If it is not, press the “SET” button again.

Figure 5-4. Blinking Temperature Code

9a. If the temperature code is correct,

press the “SET” button and go to step 10.

RH

ϒFϒC

6

5.3 Calibrating Humidity ReadingsIf you have access to accurate temperature and humidity calibration equipment,you may want to calibrate the instrument on your own as described in thissection. Figure 5-5 shows how to set up the calibration equipment. The followingflowchart shows the basic path that you should take to calibrate the sensor.

5-4


Too High?

Too Low?

Too High?

Too Low?

Take 33%SolutionReading

(after waitingone hour)

Go toSection5.3.1

Case 2

Go toSection5.3.1

Case 1

33% Readingis Correct

75% Readingis Correct

Go to Section 5.2to change Calibration Code

and probe label

Go to Section 5.2to change Calibration Code

and probe label

Take 75%SolutionReading

(after waitingone hour)

Go toSection5.3.2

Case 2

Go toSection5.3.2

Case 1

Go to Temperature Calibration(Section 5.4)


Figure 5-5. Calibration Setup.

Section 5.3.1 discusses how to change the first half of the humidity code whichcorrects the 33% humidity reading if your recorder does not show 33%. Section5.3.2 discusses how to change the second half of the humidity code whichcorrects the 75% humidity reading if your recorder does not show 75%.

Figure 5-6 shows the two parts of the humidity calibration code. The humiditycode consists of a two digit alpha-numeric code. Digits may be any one of thesecharacters:0, 1, 2, 3, 4, 5, 6, 7, 8, 9, a, b or c.

Figure 5-6. General Breakdown of the Humidity Code.

HIGH SET LOW

ALARM

CHART TYPE

1

7

32

°C

°F

PWR

I

0 74RH°C°F

TEMPERATURE

HUMIDITY

H35 T2

RH°C°F57

Corrects For33% Humidity

Corrects For75% Humidity


5.3.1 Humidity Calibration at 33% Humidity1. Set up the recorder with the temperature/humidity sensor in a sealed jar (33%RH)

using saturated magnesium chloride as shown in Figure 5-5. If you are notexperienced with saturated salt solutions, you may not obtain good results. If you areexperiencing difficulty, contact our engineering department.

2. After probe reading reaches equilibrium (after 1 hour), take a reading.

CASE 1: The 33% reading is too low by n counts, so DECREASE the humidity code by n counts.

EXAMPLE 1: you obtain a reading of 31% The error is -2 since 31 is 2 countslower than 33%. The initial humidity code of 87 (in this example) must bereduced to 67 (-2 counts).

READING INITIAL ERROR CHANGED (NEW) HUMIDITYIN 33% HUMIDITY CODE CODE IN 33% “HUMID”

ENVIRONMENT CODE ENVIRONMENT31 87* -2 67*

* the first digit is flashing and changes in this case.

CASE 2: The 33% reading is too high by n counts, so INCREASE the humidity code by n counts.

EXAMPLE 2: you obtain a reading of 37% The error is +4 since 37 is 4 countshigher than 33%. The initial humidity code of 65 (in this example) must beincreased to A5 (+4 counts; comes after 9).


ENVIRONMENT CODE ENVIRONMENT37 65* +4 A5*


3. Change the first digit before proceeding to the next step, since a change in the firstdigit affects readings throughout the range. Go through Section 5.1 to set thecalibration codes in the recorder. Then recheck to see that the reading is 33. If it isnot, adjust the first digit of the code again. After pressing the “SET” button, thesecond digit will start flashing.

4. Next, place the probe in a saturated salt environment of 75% RH using NaCl.

5. After the probe equalizes (after 1 hour), take a reading (the second digit displayedmay have changed).

6. Continue to Section 5.3.2.


5.3.2 Humidity Calibration at 75% Humidity

CASE 1: The 75% reading is too low by n counts, so DECREASE the humidity code by n counts.

EXAMPLE 1: you obtain a reading of 72% The error is -3 since 72 is 3 countslower than 75%. The initial humidity code of 67 (from Case: 1 Example 1 inprevious section) must be reduced to 64 (-3 counts).


ENVIRONMENT CODE ENVIRONMENT72 67* -3 64*


CASE 2: The 75% reading is too high by n counts, so INCREASE the humidity code by n counts.

EXAMPLE 2: you obtain a reading of 76% The error is +1 since 76 is 1 counthigher than 75%. The initial humidity code of A5 (from Case 2: Example 2 inprevious section) must be increased to A6 (+1 counts).


ENVIRONMENT CODE ENVIRONMENT75 A5* +1 A6*


Changing the second digit (following Section 5.2) does not affect readings at 33%and lower. Check to see that the reading is 75. If it is not, adjust the second digitof the code again.

You must continue to Section 5.4 to finish the calibration process.

5-7


5.4 Calibrating Temperature Readings1. To calibrate temperature, set the instrument to °F (DO NOT USE °C) and place the

sensor probe in a known, stable environment between 60° and 90° F. Read thedisplay after allowing the probe to reach equilibrium after a 15 minute warm-upperiod.

2. If the reading is TOO LOW by n counts, DECREASE the temperature code (codefollowing the letter “T”) by n counts. If the reader is TOO HIGH by n counts,INCREASE the temperature code by n counts.

Changing the temperature code will not effect humidity calibration.

Using the Cal-Lock Kit

6-1

6

The CT485B-CAL-LOCK kit that comes with the CT485B is used to preserve and protect the settings that were entered into the CT485B during the calibration process. The CT485B-CAL-LOCK cover shields the HIGH, SET and LOW calibration buttons to prevent any additional button pressing. This method is more “permanent” than using the control panel door lock. Here’s the procedure:

USE EXTREME CAUTION WHEN USING THE GLUE. READTHE WARNING LABEL ON THE TUBE.

1. Calibrate the CT485B.2. Apply a small amount of glue to the back of the cover. Refer to Figure 6-1.

Figure 6-1. Glue Application

DO NOT LET GLUE COME IN CONTACT WITH BUTTONS.

CAUTION

WARNING

3. Place cover over calibration buttons.4. Fill in the label information.5. Apply label to cover as shown in Figure 6-2.

Figure 6-2. Label Application

An additional label is supplied for future calibrations. A damaged label orremoval of the label implies that the calibration of the recorder may havebeen altered.

NOTE

CALIBRATEDBY:DATE:

Notes

Using the Cal-Lock Kit6

Using the Voltages Input Adapter (Optional)

7-1

7

Use the optional voltage input adapter to record an external 20mV to 1200mV�signal with the temperature pen. When using the Fahrenheit scale chart paper,�values between 2° and 120°F correspond to adaptor inputs of 20mV dc to�1200mV dc. The same correspondence applies to the °F display (2°F = 20mV dc;�20°F = 200mV dc; 120°F = 1200mV dc). While the voltage adapter is in use, the�humidity pen is inoperative and the humidity display is invalid.��Typical applications include monitoring analog output of panel meters, process�signals, and lab equipment. For example, if the adapter is used with a�10mV / degree analog signal, the recorder will display and record 20mV to�1200mV over the range of 2° to 120°F. If the adapter is used with a 1mV / degree�analog signal, the recorder will still display and record 20mV to 1200mV over the�range of 2° to 120°F scale on the chart. However, this plotted range now�corresponds to a range of actual temperatures of 20° to 1200°F.��Polarity of the dc input signal should correspond to the + and - markings on�the adapter.

INPUT VOLTAGES GREATER THAN 20VDC OR 10VAC RMSMAY DAMAGE THE RECORDER.

Figure 7-1 shows a typical setup using the voltage input adapter.

Figure 7-1. Voltage Input Adapter Setup

CAUTION

VoltageSource

20 mV to 1200 mV

1200 mVMaxVoltage Input

AdaptorHIGH SET LOW17

32Normal

Cal

0

I

CHART TYPEPWRALARM

PH

RECORDER

TEMPERATURE

1 4pH

ϒC

Notes

Using the Voltages Input Adapter (Optional)7

Maintaining the Recorder

8-1

8

8.1 General Considerations

Keep the recorder in a dry place. If itgets wet, wipe the case as soon aspossible to get rid of any moisture.

Do not expose the recorder to temperaturesother than those stated in the specifications(Chapter 11). The recorder can operate intemperatures as high as 120°F (49°C) or aslow as 32°F (0°C).

Handle the recorder carefully(DO NOT DROP IT).

Keep the recorder away fromexcessive dirt and dust.

Do not use strong cleaning solvents oralcohol when cleaning the outer case. Referto Section 8.3 for more details.

Do not use old or weak batteries inthe recorder. It is important tochange the batteries monthly orwhen you see the LO BAT indicator(refer to Section 2.3.1).

8.2 Light Bulb and Push Button InformationYou may notice that the light bulbs flicker slightly while the pens are moving.The flickering stops once the pens are stationary.

The light bulbs on the chart base of the recorder are long-life specialty bulbs.Even though they last a very long time, they will burn out eventually. Alwaysreplace both bulbs. The part number for ordering 10 bulb/holder assemblies islisted on the inside back cover. One extra pair of bulb assemblies is suppliedwith the recorder.

When removing the bulbs, grasp the bulb holder that contains the bulb and pullit out. Do not pull on the bulb itself. When reinserting the new bulbs in thesockets, orient the bulbs to fit as shown in Figure 8-1.

Figure 8-1. How to Hold the Bulb Assembly and Where the Bulbs are Located

In the event that the ac power to the recorder is cut of f (e.g., blackout), the recorder will continue to operate with the 4 “D” size backup batteries.The bulbs and display back light operate on ac power only

The recorder is equipped with a push button located on the chart base. Thispush button turns on and off the light bulbs which are used for illuminating thechart as well as the display back light. One press of the push button turns on and a second press turns them off. Figuree 8-2 shows the location of the push button.

Figure 8-2. Push Button Location

Light BulbPush Button

PH

RECORDER

TEMPERATURE

NOTE

TEMPERATURE

PH

RECORDER

Maintaining the Recorder8

8-2

8.3 Case CareThe case, front window and pen arms of the recorder should be cleaned with amild soap solution. Under no circumstances should you use an alcohol orsolvent based cleaner anywhere on this recorder.

8.4 Storage of Chart PaperFor optimum performance, store the chart paper in the plastic bag provided.Store the paper in rooms that have humidity levels lower than 80% relativehumidity.

8.5 Power Failure Mode (Chart Paper Indication)The chart paper indicates when the ac power failure occurred, the battery backup period and when the ac power returns. It is important to have fresh “D” sizebatteries in the recorder for battery backup so you have continuous recording.Figure 8-3 shows an example of chart paper with the power failure lines.

Figure 8-3. ac Power Failure Indication on Chart Paper

Clips

pHRECORDER

TEMPERATURE

pH

C

Maintaining the Recorder 8

8-3

Notes

Maintaining the Recorder8

Troubleshooting the Recorder

9-1

9

Table 9-1 contains a brief troubleshooting guide.Table 9-1. Troubleshooting Guide

If this occurs Perform these steps

Make sure the CHART TYPE ¡C/¡Fswitch (under the control panel door)is in the correct position

The humidity pen (blue)appears to be in the wrongposition.

?

Make sure the door is completely closedand the latch button is in the uppermostposition. It may be necessary to squeezethe case slightly to close the latch com-pletely.

The pens do not appear tobe leaving traces on thepaper.

?

Make sure the CHAR T TYPE 1/7/32switch is in the correct position.

Make sure the magnetic chart knob is inplace.

Chart paper appears not toturn, or to turn at the wrongspeed.

?

If using old batteries, replace with a freshset of alkaline batteries.

If using fresh batteries, make sure theyare inserted correctly.

Make sure the ac adaptor is securelyplugged into the wall and into the powerjack on the recorder.

Make sure POWER switch is in the |(ON) position.

Recorder appears not tofunction at all.? `

Table 9-1. Troubleshooting Guide (Cont’d)

If this occurs Perform these steps

The chart recorder is operating off batteries. Switch over to ac power if youwish to light up the paper.

Bulbs are blown. Replace them with newbulbs.

Bulbs don t light.?

Make sure pen caps are removed (andsecured on the cap posts asrecommended).

Check that the pens are locked firmly inposition in their holders.

Make sure the pens are fresh. Remove apen and test it on a piece of chart paper.Insert new pens if necessary.

The pens do not appear tobe leaving traces on thepaper.

?

Troubleshooting the Recorder9

9-2

Technical Details10

10.1 Sensors and MeasurementThe recorder has an external plug-in temperature/humidity sensor. A six-foot remote sensor cable is provided to allow remote sensing of both temperature andhumidity.

Unlike many circular hygrothermographs, this recorder utilizes electronic sensors tomeasure both ambient temperature and relative humidity. The temperature sensor is low-power, semiconductor type, with a linear voltage output proportional to temperature. The humidity sensor consists of a bulk polymer material deposited ona ceramic substrate. The mobility of the ions in the polymer changes with moisturecontent of the surrounding atmosphere. As a result, the sensor is driven by ac excitation and the wide dynamic range of its output is compressed with a logarithmic amplifier.

The electronically-conditioned output of both sensors is fed to a microprocessorvia an analog-to-digital converter. The processor linearizes and temperaturecompensates the output of the humidity circuit employing a “look-up tableapproach.“ The results of the processor calculations are then used to update the front panel display and to position the pen arms on the chart paper.

10.2 Pen Arm DriveThis recorder utilizes a motor-driven lead screw pen arm drive located in thedoor of the unit. This provides several advantages over conventional pivot armmechanisms. First, the recorder pens move along straight, radial lines as thetemperature and humidity change. Thus, the time scales on the chart paper arestraight lines and are much easier for the user to interpret than the swoopingarcs produced by a conventional recorder. Second, the placement of the recorderpen arms directly opposite one another allows the pen tips to be placed veryclose together. This minimizes time offset between information recorded by thetemperature and humidity pens, making the charts easier to interpret. Finally, thelocation of the drive mechanism in the door provides an automatic pen lift whenchanging the chart paper.

The position of the pen arms on the lead screw mechanism is controlled byoptical encoders. On power up or system reset, the pen arms move to the zeroposition. This is detected by a photo interrupter, to provide absolute positionalinformation to the microprocessor.

10-1

All humidity sensors are susceptible to contamination from outside sources that can affect accuracy and response time. Take care to prevent excessive contamination by dirt, oil, grease, solvents, etc.

NOTE

.

10.3 Chart Paper Drive MechanismThe recorder incorporates a stepper motor to impart rotational motion to thechart paper. A novel feature of the unit is its ability to utilize 1, 7 or 32 daychart paper simply through front panel switching. This capability is providedby a special digital timing circuit which precisely controls the stepping rate ofthe magnetic armature in the motor.

10.4 Power Supply SupervisionThe recorder contains power supply monitoring and switching circuitry whichenables it to be used in a variety of circumstances. Under ordinarycircumstances, the unit will be powered by 110 or 220 Vac with the ac adaptorprovided. This is the preferred mode of operation. The recorder can alsooperate via 4 “D” size batteries installed in the rear of the unit which willpower the unit up to 30 days.

The system may be restarted by changing the batteries or by the re-initiation ofac power. If ac power fails, the circuitry will attempt to automatically switch tobattery backup. If viable battery power is available, the system will operate onbattery power until the batteries fail or ac power returns. When ac powerreturns, the recorder will automatically reset itself (refer to Section 8.5).

Typically, the unit will operate with fresh alkaline batteries for about 1 month. Itshould be noted that to conserve battery power, the system timing turns thesensors on and updates the display and pen position only once every 0.5, 3.5 or16 minutes while in the 1, 7 or 32 day modes respectively. However, the displayremains in continuous operation during battery operation. You should be aware,then, that during battery operation it is possible for the display and pens to lagbehind actual ambient conditions by up to 0.5, 3.5, or 16 minutes to save power.Only when using the ac adaptor do the pens constantly update for changes inambient conditions.

Technical Details10

10-2

From this point, a count wheel mounted on the lead screw provides positional�information relative to the zero position. There are 32 counts for each division�on the chart paper.��

As with all positioning mechanisms, an error may appear in the tracking over a�period of time. To minimize this error, several steps have been taken. First, a�deadband for pen movement of 1/2 chart division has been programmed in to�minimize pen motion without affecting usable chart resolution. Second,�whenever you change chart paper, a magnetic switch detects the opening of�the door and initiates a system reset, thus re-zeroing the pens and eliminating �any accumulated errors.

Specifications

11-1

11

General

Measurement Input: pH and temperature, with plug-in external sensorRemovable for remote location

Temperature

Range: 2° to 120°F, -17° to 49°CAccuracy: ±1°CSensor: Solid StateResponse Time: 5 minutes for 63% step changeDisplay Resolution: 1°F/1°C

Humidity

Range: 2% to 98% RHAccuracy: ±3% @ 25°C, between 20% and 90% of range;

±5% below 20%, above 90% @ 25°CSensor: Resistive polymerResponse Time: 5 minutes for 30% to 80% step changeDisplay Resolution: 1°C

Display

Types: 21⁄2 digit LCD, 0.5” high; low battery andparameter indication

Display Modes User-switchable between °F, °C and %RH forcontinuous display; max/min storage for bothtemperature and humidity

Electronics

Type: Microprocessor-controlled. HI & LO Peak Holdfor both temperature and pH; re-initializesposition at every chart change (every time door isopened)

Chart Paper

Type: 8 inch (200mm) circular, double-sided, withlinear radial divisions; 1, 7 and 32 day

Chart Drive

Type: Stepper MotorRanges: 1, 7, 32 day; switchableAccuracy: 1% of rotationChart Paper Hold Down: Magnetic hub lock

Recording Pens

Type: Disposable fiber-tip; red for temperature, bluefor humidity

Pen Drive

Type: Motorized linear screw driveDeadband: 1°F, 1%RHZero: Automatic zero during chart change or power

interruptionPen Arms: Clear plastic to allow full chart viewingPen Lift: Automatic upon door opening; pens are door

mounted and lift away from the chart wheneverthe door opens.

Alarms

Alarms: User-selectable for high or low temperature andhumidity

Audible Alarm: Integral piezo-electric beeperAlarm Relay Contacts: 2A 110Vac, 2A 30Vdc, Normally Open, Single

Pole, Single Throw (SPST)

Operating Conditions (Recorder)

Temperature: 32° to 120°F (0° to 49°C)Humidity: 0% to 90% RH, non-condensing

Operating Conditions (Remote Sensor)

Temperature: 2° to 120°F (-17° to 49°C)Humidity: 2% to 98% (should not be operated continuously

in condensing conditions)

Specifications11

11-2

Power (Recorder)

dc: Four (4) “D” size alkaline batteries; greater than1 month continuous operation in 32 day mode;bulbs will not light on battery power.Recommended battery type: Duracell TypeMN1300 “D” size batteries for best performanceat low temperatures.

ac: 110Vac or 220Vac 50/60 Hz stepped down tonominal 9Vdc using ac adaptor provided

Power 300 mA “normal” during pen movement for Requirements: battery (dc power); 500 mA “normal” during pen

movement for ac power using ac adaptor. (Note: The light bulbs draw 200 mA of current Display back light draw 20mA).

ac Power Jack 8.3 to 12.4 Vdc, (nominal 9Vdc) 1A max. Voltage: An ac adaptor is supplied

Mechanical

Dimensions: 133⁄16” x 1011⁄16” x 25⁄8”(H x W x D) (33.5 x 27.1 x 6.7 cm)Weight: Approx. 7 lbs, including alkaline batteriesMounting: “Keyhole” slots for wall mounting; foot cover for

benchtop useCase: Rugged ABS plastic, color: gray or whiteMiscellaneous: Swing-out stabilizing arm for bench top use,

decorative foot cover for wall mounting, and 6 ftremote sensor cable for remote sensing.(USE ONLY ONE 6 FT REMOTE SENSOR CABLEPER RECORDER FOR ACCURATE READINGS)

Specifications 11

11-3

Notes

Specifications11

Index

l

I

A

Accessories ................. Inside Back Coverac Adapter ............................................. 2-5ac Power Failure Indication ................ 8-3ac Power Hookup ................................. 2-5Alarm Display Buttons ................ 1-3, 4-3

HIGH ................................... 1-3, 4-3LOW .................................... 1-3, 4-3SET ....................................... 1-3, 4-3

Alarm Limits ......................................... 4-1Disabling the alarm .................. 4-4Setting the alarm ....................... 4-3Turning off the alarm ............... 4-4Operation of .............................. 4-1

Alarm/Relay Contacts ................. 1-4, 4-1

B

Batteries (“D” size) ............................... 2-3Installing .................................... 2-4Replacing ................................... 2-4

Battery Compartment .................. 1-4, 2-4Battery Usage

Indication on Paper .................. 8-3Bench Top Use ...................................... 2-1Bulb Replacement ................................ 8-2

C

Calibrating ............................................ 5-4Codes ................................... 3-1, 5-1

Calibration Lock Out Labels ................6-1, ............................Inside Back Cover

Cal-Lock Kit .......................................... 6-1Care of

Bulbs ........................................... 8-2Case ............................................ 8-3Chart Paper ................................ 8-3

Carrying Slot ......................................... 1-4Chart Paper Knob, magnetic ....... 1-2, 2-7

Chart Paper, SpecialtyArty Gallery...... Inside Back CoverComputer Rooms.... Inside Back Cover�Hospitals ......... Inside Back CoverLabs, Clean Rooms.. Inside Back CoverMuseum............Inside Back Cover

Chart PaperInstalling .................................... 2-6Standard ..................................... 1-2

Codes

Sensor........................................... 3-2Relative Humidity..................... 3-2

Temperature................................3-1Consumables .............. Inside Back CoverControl Panel Door Lock ............. 1-3, 4-2Control Panel Door

Locking ....................................... 4-2Unlocking .................................. 4-2

Cover for feet & stabilizing arm . 1-3, 2-1

D

“D” size Batteries ................................. 2-3Display ................................................... 1-3Display Mode (°F/°C/RH) .................. 3-3Displays

LO BAT ...................................... 2-5System Shut Down ................... 2-5

Latch Button (Door Release) ............... 1-3

F

Foot Cover ..................................... 1-3, 2-1

H

HIGH Button ................................. 1-3, 4-3

I

InstallingBatteries ...................................... 2-4Chart Paper ................................ 2-6Pens ............................................. 2-8Temp./Humidity Sensor ......... 2-11

J

Jack, ac power ....................................... 1-3

L

Latch Button for Door ..........................1-3LCD Display ......................................... 1-3Lock for Control Panel Door ....... 1-3, 4-2Lock Out Labels .. 6-1, Inside Back CoverLow Battery Warning .......................... 2-5LOW Button ................................... 1-3, 4-3

M

Maintenance of Recorder .................... 8-1Mounting Holes (“Keyhole”) ............. 1-4

O

ON/OFF Switch ............................ 1-3, 3-1

P

Pen Cap Posts ................................ 1-2, 2-9Pen Holders ........................................ 2-10Pen Replacing ....................................... 2-8Pen Types

Blue (Relative Humidity) .......... 2-7Red (Temperature) ................... 2-7

Powerac ................................................. 2-5Battery ........................................ 2-3dc ................................................. 2-3

Power Failure Indication on Paper .... 8-3Power Switch ................................. 1-3, 3-1Powering Up the Recorder ................. 3-1Product Specifications ....................... 11-1Push Button (Light Bulb) .................... 8-2

R

Relay/Alarm Contacts ........................ 4-1Relative Humidity Code.......................4-1

Remote Sensor Cable, 6 ft (2 m) ....... 2-12Remote Sensor Clip.... 2-13, Inside Back Cover Removing the Pens ............................ 2-10Replacing the Bulbs ............................. 8-2

S

Sensor:Codes .......................................... 3-1Correct Position ...................... 2-11Holder (clip)................................1-3Temperature/Humidity............1-3

SET Button ..................................... 1-3, 4-3Spare Parts .................. Inside Back CoverSpecifications ...................................... 11-1Stabilizing Arm .................................... 2-6Switches

Power .......................................... 1-3°C/°F ........................................ 1-31/7/32 day ................................ 1-3%RH, °C/°F ................................ 1-3

T

Technical Information ....................... 10-1Temperature Code ............................... 3-1Temperature Sensor ............................. 1-3Time Set Arrow ............................. 1-2, 2-7Troubleshooting Guide ....................... 9-1

V/W

Voltage Input Adapter Option ............ 7-1

Wall Mounting ..................................... 2-3

IndexI

II

The following models are available:

CT-485B-110V-G-AL 110Vac, with Alarms and Relay ContactsCT-485B-110V-W-AL 110Vac, with Alarms and Relay ContactsCT-485B-220V-G-AL 220Vac, with Alarms and Relay ContactsCT-485B-220V-W-AL 220Vac, with Alarms and Relay Contacts

The following consumable items are available:

PENSCT485-PS Pen Set, Red and Blue, package of 1 eachCT485-PS-6 Pen Set, Red and Blue, package of 6 each

STANDARD CHART PAPER (double-sided - available as single package of 100 or 6 packages of 100 charts)CT485-CDC 100 Charts, 1 Day, °C CT485-CDC-6 600 Charts, 1 Day, °CCT485-CWC 100 Charts, 7 Day, °C CT485-CWC-6 600 Charts, 7 Day, °CCT485-CMC 100 Charts, 32 Day, °C CT485-CMC-6 600 Charts, 32 Day, °C

[SPECIALTY PAPER (all double-sided, packages of 20 charts)] [(*) = C for °C CT485-MW(*)

The following spare parts are available:

CT485B-WALLKIT Anchors, Screws, Inserts and TemplateCT485-CABLE-6W 6 Ft. (2 meter) Remote Sensor Cable, WhiteCT485-CABLE-6G 6 Ft. (2 meter) Remote Sensor Cable, GrayCT485-AC-110 9V 110Vac Adaptor, 9Vdc outputCT485-AC-220 9V 220Vac Adaptor, 9Vdc outputCT485B-MAG Magnetic Chart Knob, TanCT485B-BULB Light Bulb Assembly, package of 10CT485B-RP-W Temperature/Humidity Sensor (replacement probe), WhiteCT485B-RP-G Temperature/Humidity Sensor (replacement probe), GreyCT485B-CAL-KIT Calibration Kit (33% & 75% Salt Solutions)CT485B-CAL-LABEL Calibration Lockout Cover Labels (Sheet of 10)CT485B-CAL-LOCK Calibration Lockout KitCT485B-CLIP-KIT Sensor Clip Kit

The following accessories are available:

CT485-AMV-W Analog BNC Input Adaptor (Cable), WhiteCT485-AMV-G Analog BNC Input Adaptor (Cable), Gray

PART NUMBER DESCRIPTION




Patents:U.S. Patented 5,019,838;D311,695/Canada 1,306,452;1,319,925; 65,619 OMEGAEngineering, Inc. RD1990/Germany M 88 03 842.4/Italy 0055451/Korea 102,879/ROC Patent No. 22507/U.K. REGISTERED1 055 583.

Museums/Art Galliries, 7 days (in°C or°F) 18.3° to 22.2°C (65° to 72°F), 40 to 50%RHCT485-MM(*) Museums/Art Galliries, 32 days (in°C or°F) 18.3° to 22.2°C (65° to 72°F), 40 to 50%RHCT485-HW(*) Hospitals, 7 days (in°C or°F) 20° to 22.2°C (68° to 74°F), 40 to 50%RHCT485-HM(*) Hospitals, 32 days (in°C or°F) 20° to 22.2°C (68° to 74°F), 40 to 50%RHCT485-LW(*) Labs, Clean Rooms, 7 days (in°C or°F) 20° to 23.9°C (68° to 75°F), 40 to 55%RHCT485-LM(*) Labs, Clean Rooms, 32 days (in°C or°F) 20° to 23.9°C (68° to 75°F), 40 to 55%RHCT485-PW(*) Computer Rooms/Offices, 7 days (in°C or°F) 18.3° to 23.9°C (65° to 75°F), 45 to 60%RHCT485-PM(*) Computer Rooms/Offices, 32 days (in°C or°F) 18.3° to 23.9°C (65° to 75°F), 45 to 60%RH

M2309/N/0995

For immediate technical or application assistance please call:

Newport Electronics, Inc.2229 South Yale Street • Santa Ana, CA • 92704-4426 • U.S.A.

TEL: (714) 540-4914 • FAX: (714) 546-3022Toll Free: 1-800-639-7678 • e-mail: [email protected]

Newport Technologies, Inc. 976 Bergar • Laval (Quebec) • H7L 5A1 • Canada

TEL: (514) 335-3183 • FAX: (514) 856-6886Toll Free: 1-800-639-7678 • e-mail: [email protected]

Newport Electronics, Ltd.One Omega Drive • River Bend Technology Centre Northbank, Irlam, • Manchester, M44 5EX, England Tel: 44 (161) 777-6611 • FAX: 44 (161) 777-6622

Toll Free: 0800-488-488 • e-mail: [email protected]

Newport Electronics B.V.Postbus 8034 • 1180 LA Amstelveen • The Netherlands

TEL: (31) 20 6418405 • FAX: (31) 20 6434643Toll Free: 0800 0993344 • e-mail: [email protected]

Newport Electronics spol s.r.o.ul. Rude armady 1868, 733 01 Karvina-Hranice • Czech Republic

TEL: 420 (69) 6311899 • FAX: 420 (69) 6311114Toll Free: 0800-1-666432 • e-mail: [email protected]

Newport Electronics GmbHDaimlerstrasse 26 • D-75392 Deckenpfronn • Germany

TEL: 49 (07056) 3017 • FAX: 49 (07056) 8540Toll Free: 0130 11 21 66 • e-mail: [email protected]

Newport Electronique S.A.R.L.9, rue Denis Papin • 78190 Trappes • France

TEL: (33) 130-621-400 • FAX: (33) 130-699-120Toll Free: 0800-4-63978 • e-mail: [email protected]

Mexico and Latin AmericaTEL: 95-800-639-7678 • FAX: 95-203-359-7807

En Español: (203) 359-7803 • e-mail: [email protected]

Internet e-mail

[email protected] On-Line Service

http://www.newportinc.com

NEWPORT Electronics,Inc.

®

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